28 



stridulatbg organs as already defined, which are usually better developed in the 

 female than in the male. 



The 2nd abdominal tergum is medially carinated in less than its posterior 

 half, the 3rd in almost all its extent, the carina in both cases being sulcate : the 

 4th-6th are all sharply carinated, the carina of the 4th and 5th being deeply 

 cleft at its after end. The 6th abdominal somite is nearly twice as long as the 

 5th, but shorter than the telson. The telson is about as long as the inner caudal 

 swimmeret : it ends very acutely and has, near the apex, 4 pairs of large marginal 

 spines, the last pair being fixed. 



Eyes large. Antennular flagella equal, about one-third the length of their 

 peduncle. 



The 3rd maxillipeds nearly reach the tip of the antennal scale : the dactylus 

 is slender and is not much shorter than the propodite, with which it articulates 

 end-on : the basis bears an antrorse spine. A similar spine is present on the 

 basis of the 1st two chelipeds and on the ischium of the 1st. 



In the female only there is a pair of sternal spines between the 2nd pair of 

 chelipeds. 



All the thoi-acic legs have longish exopodites. 



The andricum, which is built in the same way as that of M. coniger, is 

 asymmetrical, the left lobe being the longer : the outer lobule of the left lobe 

 ends in a crown of stiffish filaments. 



The thelycum consists of the following parts : — (1) between the 5th pair of 

 legs a transverse lamina more or less distinctly divided into three lobes, the 

 outer of which — abutting on the 5th legs — are bluntly dentiform : (2) between 

 the 4th pair of legs a broad transverse plate the anterior part of which shows 

 as a large, smooth, somewhat oval facet : (3) in the interval between the 4th 

 and 5th legs a narrow transverse bar, sinuous and shaped like a very open W. 



Large females may attain a length of 3| inches. 



There are 140 specimens in the collection, registered as follows : — 



1_ Types Orissa coast, 28—25 fathoms. ") 



9 



9180 9182 3513 5084 

 " 6 ■ 6 ' 10 ■ 10 

 8567 5079 



9 ' 10 

 5080 



10 

 5081 



10 

 5082 



10 

 5083 



10 



Andamaus, to 20 fatboms. 

 Ganjam coast, 20 — 35 fathoms. 

 Vizagapatam coast, 20 fathoms. 

 Madras coast, 31 fathoms. 

 Palk Strait. 

 G. of Martabati, 20 fathoms. 



-"Investigator." 



